Control of a cascaded H-bridge multilevel converter for grid connection of photovoltaic systems

Kouro, Samir; Wu, Bin; Moya, Álvaro; Villanueva, E.; Correa, Pablo; Rodríguez, José

doi:10.1109/iecon.2009.5415332

Cited by 133 publications

(47 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 is composed by (3) and (4) to estimate P and Q, and by (17) and (18) to estimateṖ anḋ Q respectively. The virtual flux observer block of Fig.…”

Section: Classic Virtual Flux Direct Power Controlmentioning

confidence: 99%

“…CHBs have promising application field in active filters, FACTS and in large PV systems [16]- [18], since they do not require the complicated zig-zag transformer that they need for motor applications, and can operate with reduced switching frequency and reach higher voltages. The CHB could also be useful for multi-pole multi-winding wind turbines [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generalized direct power control for grid connected multilevel converters

Rivera

Kouro

Cortés

et al. 2010

2010 IEEE International Conference on Industrial Technology

Self Cite

View full text Add to dashboard Cite

This paper presents a generalized direct power control (DPC) scheme for grid connected multilevel converters. The proposed method extends the original DPC operating principle by considering only for selection the closest vectors to the present switching state. This approach requires the power derivatives for feedback, which can present numerical implementation problems in real time. Therefore a grid virtual flux based observer is proposed to overcome this issue. The proposed method is applicable to any multilevel converter topology of any number of levels. In this paper simulations results are presented for a 9 level cascaded H-bridge converter. The proposed solution enables DPC for multilevel converters used in medium voltage applications while improving overall power quality and efficiency of the system.

show abstract

“…5 is composed by (3) and (4) to estimate P and Q, and by (17) and (18) to estimateṖ anḋ Q respectively. The virtual flux observer block of Fig.…”

Section: Classic Virtual Flux Direct Power Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generalized direct power control for grid connected multilevel converters

Rivera

Kouro

Cortés

et al. 2010

2010 IEEE International Conference on Industrial Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…This type of imbalance has been dealt with in the past for single phase CHB PV systems. The same approach used in [14] is considered in this work, and therefore will not be addressed in full detail. The idea behind the balancing mechanism is to distribute the usage of the cells of one phase in the same proportion of the imbalance by adjusting (redistributing) the on and off times given by the PWM strategy.…”

Section: ) Per-phase Imbalance Compensationmentioning

confidence: 99%

“…The dc-link voltage imbalance degrades the power quality introducing voltage distortion at the grid side, and more importantly, represents a hazard for the converter if voltage limits of the capacitors are exceeded. This has been addressed in several ways for single phase systems [12], [14]. To reach higher capacity for large scale plants, three-phase configurations are needed.…”

Section: Introductionmentioning

confidence: 99%

Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

Rivera

Kouro

et al. 2011

2011 IEEE International Symposium on Industrial Electronics

196

View full text Add to dashboard Cite

Abstract-Large scale grid connected photovoltaic (PV) energy conversion systems have reached the megawatt level. This imposes new challenges on existing grid interface converter topologies and opens new opportunities to be explored. In this paper a new medium voltage multilevel-multistring configuration is introduced based on a three-phase cascaded H-bridge (CHB) converter and multiple string dc-dc converters. The proposed configuration enables a large increase of the total capacity of the PV system, while improving power quality and efficiency. The converter structure is very flexible and modular since it decouples the grid converter from the PV string converter, which allows to accomplish independent control goals.The main challenge of the proposed configuration is to handle the inherent power imbalances that occur not only between the different cells of one phase of the converter but also between the three phases. The control strategy to deal with these imbalances is also introduced in this paper. Simulation results of a 7-level CHB for a multistring PV system are presented to validate the proposed topology and control method.

show abstract

“…9, a maximum of Vpv1+Vpv2 is obtained at the inverter output voltage, Vinv). In fact, this characteristic has motivated the study of different maximum power point tracking strategies which enables the independent control of each group of photovoltaic modules [45,46], while controlling the current injected into the electric grid. It is worth pointing out that some works have exploited this modular structure to work even with damaged power cells [47,48], thus increasing the reliability of the system.…”

Section: Cascaded H-bridge (Chb)mentioning

confidence: 99%

Transformerless topologies for grid-connected single-phase photovoltaic inverters

Patrao

Figueres

González-Espín

et al. 2011

Renewable and Sustainable Energy Reviews

157

View full text Add to dashboard Cite

In order to improve the efficiency of a photovoltaic system, it is possible to use a transformerless photovoltaic inverter. However, this topology needs to be studied in detail, as it presents some problems related to the galvanic connection between the grid and the photovoltaic generator (e.g. efficiency degradation and safety problems).In this paper, a review of grid-connected single-phase photovoltaic inverters based on transformerless topologies has been carried out. On the one hand, some alternatives based on classical topologies have been presented. On the other hand, alternatives based on multi-level inverter topologies have been studied, showing up that no leakage current is generated in comparison to classical topologies.

show abstract

Control of a cascaded H-bridge multilevel converter for grid connection of photovoltaic systems

Cited by 133 publications

References 16 publications

Generalized direct power control for grid connected multilevel converters

Generalized direct power control for grid connected multilevel converters

Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems

Transformerless topologies for grid-connected single-phase photovoltaic inverters

Contact Info

Product

Resources

About